Hold Breath. The walrus can hold its breath for 10 minutes.
Tusks. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:7 (2d4 + 2) piercing damage.
Walruses are bulky marine mammals that favor arctic climates and communicate by grunting and roaring. A typical adult specimen weighs at least 2,000 pounds. Humans hunt them for their meat, fat, skin, bones, and tusks.